Power supply apparatus for vehicle and method of controlling power supply apparatus for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMasaharu Yamashita, Ippei Yamazaki
Life of this patent
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Abstract
When a change in an output voltage of a main power supply is a decrease, and a degree of the decrease is larger than a reference value, a power supply control portion decreases a boosted voltage of a voltage-boosting circuit according to the degree of the decrease. When the change in the output voltage of the main power supply is an increase, and a degree of the increase is larger than the reference value, the power supply control portion increases the boosted voltage of the voltage-boosting circuit according to the degree of the increase.
Claims11
A power supply apparatus for a vehicle, comprising:
- a main power supply that supplies electric power to a plurality of vehicle-mounted electric loads;
- a voltage-boosting circuit that boosts an output voltage of the main power supply, and outputs the electric power, whose voltage is boosted, to a specific vehicle-mounted electric load among the plurality of the vehicle-mounted electric loads;
- a subsidiary power supply that is connected in parallel to a circuit that connects the voltage-boosting circuit to the specific vehicle-mounted electric load, wherein the subsidiary power supply is charged with the electric power output from the voltage-boosting circuit, and the subsidiary power supply assists supply of the electric power to the specific vehicle-mounted electric load using the electric power with which the subsidiary power supply is charged;
- a power supply change detection portion that detects a change in a state of the supply of the electric power from the main power supply;
- and
- a boosted-voltage control portion that controls the boosted voltage of the voltage-boosting circuit, based on the change in the state of the supply of the electric power detected by the power supply change detection portion, wherein
- the power supply change detection portion detects a degree of a change in the output voltage of the main power supply;
- and
- the boosted-voltage control portion decreases the boosted voltage of the voltage-boosting circuit when the change in the output voltage of the main power supply is a decrease in the output voltage of the main power supply, and a degree of the decrease is larger than a decrease threshold value.
A method of controlling a power supply apparatus for a vehicle, the power supply apparatus including a main power supply that supplies electric power to a plurality of vehicle-mounted electric loads;
- a voltage-boosting circuit that boosts an output voltage of the main power supply, and outputs the electric power, whose voltage is boosted, to a specific vehicle-mounted electric load among the plurality of the vehicle-mounted electric loads;
- and a subsidiary power supply that is connected in parallel to a circuit that connects the main power supply to the specific vehicle-mounted electric load, wherein the subsidiary power supply is charged with the electric power output from the voltage-boosting circuit, and the subsidiary power supply assists supply of the electric power to the specific vehicle-mounted electric load using the electric power with which the subsidiary power supply is charged, the method comprising:
- detecting a degree of a change in the output voltage of the main power supply;
- and
- decreasing the boosted voltage of the voltage-boosting circuit, when the change in the output voltage of the main power supply is a decrease in the output voltage of the main power supply, and a degree of the decrease is larger than a decrease threshold value.
Dependencies are inferred from the claim text.